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usb: usbtmc: Fix disconnect/poll interaction 

When the device is disconnected poll waiters were not being woken.

Changes for v2:
  - add commit summary
  - add Fixes and Reported-by tags

Fixes: eb6b92ecc0 ("Add support for receiving USBTMC USB488 SRQ notifications via poll/select")
Reported-by: Oliver Neukum <oneukum@suse.com>
Signed-off-by: Dave Penkler <dpenkler@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Dave Penkler 2016-02-18 10:03:00 +01:00 committed by Greg Kroah-Hartman
parent 6edd87f589
commit f9cfabcecd
1 changed files with 2 additions and 1 deletions
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3
drivers/usb/class/usbtmc.c
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@ -1525,13 +1525,14 @@ static void usbtmc_disconnect(struct usb_interface *intf)
dev_dbg(&intf->dev, "usbtmc_disconnect called\n");
data = usb_get_intfdata(intf);
usbtmc_free_int(data);
usb_deregister_dev(intf, &usbtmc_class);
sysfs_remove_group(&intf->dev.kobj, &capability_attr_grp);
sysfs_remove_group(&intf->dev.kobj, &data_attr_grp);
mutex_lock(&data->io_mutex);
data->zombie = 1;
wake_up_all(&data->waitq);
mutex_unlock(&data->io_mutex);
usbtmc_free_int(data);
kref_put(&data->kref, usbtmc_delete);
}